EP1510011B1 - Verfahren zum verbinden eines umts-mobilfunksystems mit einem funknetzwerk - Google Patents

Verfahren zum verbinden eines umts-mobilfunksystems mit einem funknetzwerk Download PDF

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Publication number
EP1510011B1
EP1510011B1 EP03722934A EP03722934A EP1510011B1 EP 1510011 B1 EP1510011 B1 EP 1510011B1 EP 03722934 A EP03722934 A EP 03722934A EP 03722934 A EP03722934 A EP 03722934A EP 1510011 B1 EP1510011 B1 EP 1510011B1
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EP
European Patent Office
Prior art keywords
receiver
mobile radio
switched
paging
signals
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP03722934A
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English (en)
French (fr)
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EP1510011A1 (de
Inventor
Frank Philips Intellec. Prop. & Stand. HEINLE
Axel Philips Intellec. Prop. & Stand. HERTWIG
Cornelis H. Philips Intellec. Prop & Stand BERKEL
Patrick P.E. Philips Intellec. Prop. MEUWISSEN
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NXP BV
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NXP BV
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the invention relates to a method of connecting an UMTS mobile radio to a network, more particularly of shortening the initial synchronization time and/or extending the standby time of an UMTS mobile radio, the UMTS mobile radio, when its HF receiver is switched on, receiving signals from the base stations around it on various physical channels of the UMTS (Universal Mobile Telecommunication System), which signals are particularly used for initial synchronization, neighbor cell measurement and paging reception and occur in certain frames of the UMTS.
  • UMTS Universal Mobile Telecommunication System
  • Such a method is known from technical specification 3 GPPTS 25.214 V3.10.0 (2002 to 2003), more particularly Annex C, p.49, and from the title WCDMA for UMTS, Radio Access For Third Generation Mobile Communications, Harri Holma, Antti Toskala, John Wiley & Sons, Ltd., Chichester, New York, Weinheim, Brisbane, Singapore, Toron to.
  • UMTS has CDMA (code-division multiple access).
  • the information is then always simultaneously available in the various physical channels.
  • the various physical channels are particularly used for the initial synchronization, for the neighbor cell measurement and the paging reception.
  • the channels are in particular:
  • Mobile radios With mobile radios the standby time, that is the period of time up to the necessary recharging of the battery, is an important property of use. Mobile radios usually switch to an energy-saving mode when there is no active speech or data connection. However, the mobile radio is to periodically receive information from the network to be informed of an incoming call and to establish changes of base stations in the environment.
  • the high-frequency (HF) receiver of the mobile radio is to be switched on
  • the standby time is determined by the power consumption of the HF receiver.
  • the power consumption of the HF receiver is high compared to the other systems of the mobile radio. The shorter the HF receiving windows are the longer will be its availability.
  • the time necessary for an initial synchronization of the mobile radio is to be short so that the mobile radio, once it has changed its location, finds a network connection in minimal time and goes to the standby mode.
  • the greater part of the signal processing functions is usually implemented in real-time hardware. Due to the high data rate at the input of the digital baseband receiver of the UMTS mobile radio, the incoming data are processed as they come in (on the fly). Only the final results of the respective bills are stored. All processing steps which need information from previous steps are executed sequentially. During this time the HF receiver is to be switched on. Since the sequential processing requires a long time, the RF receive window is to be equally long. Due to the high power consumption when the HF receiver is switched on the standby time is reduced accordingly. This holds both for the initial synchronization and for the neighbor cell measurement and paging reception to be executed during the standby time.
  • US 6,151,353 describes a pre-acquisition frequency offset removal in a GPS receiver.
  • the GPS receiver includes a RF/IF module and a memory.
  • the RF/IF module is switched-off after a predetermined time to reduce the energy consumption.
  • the DSSS signal processing architecture permits the GPS receiver to be turned-off during most of the acquisition phase of reception.
  • the received signals are stored in the memory and processed after the RF/IF receiver is switched-off. It is disclosed to store a length of an input signal of at least 20 ms of the signal.
  • a time-limited receive window the signals of all interesting channels are received simultaneously and stored.
  • the HF receiver is switched on.
  • the HF receiver is switched off.
  • the evaluation of the stored signals then takes place when the HF receiver is switched off, thus in a time in which the power consumption of the mobile radio is comparatively low. All in all this leads to a lengthening of the standby time.
  • the digital signal processing thus takes place off-line.
  • the RF receive window preferably has the time length of a frame of the UMTS. This frame is 10 ms long.
  • the RF receive window may also have a variable length of time in dependence on the receiving conditions.
  • Figs. 1 to 4 only three relevant neighbor cells are assumed to simplify the drawing. In practice, up to 32 neighbor cells are to be captured.
  • the user switches the UMTS mobile radio on at a random instant. After a certain build-up time at instant t0 a memory of the mobile radio receives all the information occurring in a single frame of the PSCH, SSCH, CPICH of the accepted four cells (compare frame buffering in Fig. 2). This takes place in the period of time t0 to t1, within a single frame i.e. 10 ms. At the instant t1 the HF receiver switches off. The period of time Ta between t0 and t1 is the receive window. The stored information is evaluated after the instant t1 in the mobile radio while the HF receiver is switched off.
  • a measurement of the neighbor cells cell 2, cell 3, cell 4 starts simultaneously with the evaluation of the paging signals on the channels PICH, PCH.
  • the paging period lasts at least 8 frames (not shown in Fig. 3).
  • the HF receiver is to be switched on for at least four frames in a paging period that contains eight frames.
  • the received data are used for resynchronization with the serving cell of the network.
  • the necessary UMTS system measurements of the neighbor cells are evaluated.
  • a paging period PP which comprises 8 to 512 frames and a measuring period MP used for the neighbor cell measurement, which lasts 8 paging periods.
  • PICH and PCH signals occur in each paging period.
  • HF receive time windows RF receive windows
  • RF receive windows are found in each PICH signal and only in one PCH signal of the measuring period MP.
  • the postsynchronization with the serving cell compare Fig. 5 CPICH propagation path detection on serving cell
  • the paging evaluation compare Fig. 5 paging processing
  • the neighbor cell measurement compare Fig. 5, CPICH system measurements on neighbor cells.
  • the RF receive windows are 533 ⁇ s long at the most in PICH.
  • the RF receive window has the length of a frame in PCH. After storage, the signals are processed off-line, as is described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Function (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Radio Relay Systems (AREA)
  • Circuits Of Receivers In General (AREA)

Claims (6)

  1. Ein Verfahren zum Verbinden eines UMTS-Mobilfunksystems mit einem Funknetzwerk, umfassend die folgenden Schritte:
    - Empfangen von Signalen von einem Sender auf einem Kanal, wenn sein Hochfrequenzempfänger, im Folgenden HF-Empfänger genannt, eingeschaltet ist,
    - Speichern von empfangenen Signalen in einem Speicher,
    - Abschalten des HF-Empfängers nach dem Empfangen und Speichern der Signale,
    - Zuführen und Auswerten der Signale im Mobilfunksystem,
    gekennzeichnet durch
    - Einschalten des HF-Empfängers für die Dauer eines Empfangszeitabschnitts eines UMTS-Frames,
    - Empfangen von Signalen von mehreren Basisstationen in der Umgebung des Mobilfunksystems, die während des Empfangszeitabschnitts auftreten, auf einem primären Synchronisierungskanal, im Folgenden PSCH genannt, auf einem sekundären Synchronisierungskanal, im Folgenden SSCH genannt, und auf einem gemeinsamen Pilotkanal, im Folgenden CPICH genannt,
    - Anfangssynchronisieren und Auswählen einer Basisstation auf der Grundlage der während des Empfangszeitabschnitts von den mehreren Basisstationen empfangenen Informationen,
    - Abschalten des HF-Empfängers nach dem Empfangen und Speichern der Signale,
    - Einschalten des HF-Empfängers zum Zwecke der Resynchronisierung des Mobilfunksystems zu einem vorgegebenen Zeitpunkt, bevor Informationen, die in einem Funkrufkanal, im Folgenden PCH genannt, enthalten sind, durch die ausgewählte Basisstation übertragen werden,
    - Empfangen und Speichern eines Frames, der Informationen des Funkrufkanals und Informationen des CPICH für die Messungen von Nachbarzellen enthält,
    - Abschalten des HF-Empfängers nach dem Ende eines Frames,
    - gleichzeitiges Verarbeiten der Funkrufinformationen im PCH und Auswerten der Messungen von Nachbarzellen, die im CPICH enthalten sind.
  2. Ein Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass zum Zwecke einer Anfangssynchronisierung der HF-Empfänger zu einem zufälligen Zeitpunkt eingeschaltet wird und dass nach einer Anlaufzeit ein Frame des von den Basisstationen ausgesendeten UMTS-Signals empfangen und gespeichert wird.
  3. Ein Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass in einem Standby-Modus des UMTS-Mobilfunksystems der HF-Empfänger zu definierten Zeitpunkten periodisch eingeschaltet wird, um die Funkrufsignale zu empfangen und eine Nachbarzellensynchronisierung durchzuführen, während die definierten Zeitpunkte kurz vor dem Empfang der notwendigen PCH-Informationen liegen.
  4. Ein Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Funkrufanzeigekanal, im Folgenden PICH genannt, ignoriert wird, falls der PCH im empfangenen Frame empfangen und gespeichert wird.
  5. Ein Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass, wenn eine Messperiode, in der die Nachbarzellenmessung erfolgt, länger als die Funkrufperiode ist, der PCH nur einmal pro Messperiode empfangen, gespeichert und ausgewertet wird und anderenfalls in jeder Funkrufperiode nur der PICH gespeichert und ausgewertet wird.
  6. Ein Mobilfunksystem, das gemäß dem UMTS-Kommunikationsstandard arbeitet, umfassend:
    einen HF-Empfänger, einen Speicher und eine Verarbeitungseinheit, wobei das Mobilfunksystem so ausgelegt ist, dass es Signale empfängt, während der HF-Empfänger eingeschaltet ist, und nach einem vorgegebenen Zeitabschnitt abgeschaltet wird, wobei der Speicher so ausgelegt ist, dass er die empfangenen Signale speichert, die der Verarbeitungseinheit zugeführt werden, um verarbeitet zu werden, während der HF-Empfänger abgeschaltet ist, dadurch gekennzeichnet, dass der HF-Empfänger so ausgelegt ist, dass er für die Dauer eines Empfangszeitabschnitts eines UMTS-Frames eingeschaltet wird, und der HF-Empfänger so ausgelegt ist, dass er Signale von mehreren Basisstationen in der Umgebung des Mobilfunksystems, die während des Empfangszeitabschnitts auftreten, auf dem primären Synchronisierungskanal, im Folgenden PSCH genannt, auf dem sekundären Synchronisierungskanal, im Folgenden SSCH genannt, und auf dem gemeinsamen Pilotkanal, im Folgenden CPICH genannt, empfängt,
    das Mobilfunksystem für das Anfangssynchronisieren und Auswählen einer Basisstation auf der Grundlage von während des Empfangszeitabschnitts von den mehreren Basisstationen empfangenen Informationen ausgelegt ist, wobei der HF-Empfänger so ausgelegt ist, dass er nach dem Empfangen und Speichern der Signale abgeschaltet wird, wobei der HF-Empfänger so ausgelegt ist, dass er zum Zwecke der Resynchronisierung zu einem vorgegebenen Zeitpunkt, bevor Informationen, die in einem Funkrufkanal, im Folgenden PCH genannt, enthalten sind, von der ausgewählten Basisstation empfangen werden, eingeschaltet wird, wobei das Mobilfunksystem so ausgelegt ist, dass es einen Frame, der Informationen des Funkrufkanals und Informationen des CPICH für die Messungen von Nachbarzellen enthält, empfängt und speichert, wobei der HF-Empfänger so ausgelegt ist, dass er nach dem Ende eines Frames abgeschaltet wird, wobei das Mobilfunksystem so ausgelegt ist, dass es gleichzeitig die Funkrufinformationen im PCH verarbeitet und die Messungen von Nachbarzellen, die im CPICH enthalten sind, auswertet.
EP03722934A 2002-05-23 2003-05-19 Verfahren zum verbinden eines umts-mobilfunksystems mit einem funknetzwerk Expired - Lifetime EP1510011B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10222970A DE10222970A1 (de) 2002-05-23 2002-05-23 Verfahren zur Netzverbindung eines UMTS-Mobilfunkgeräts
DE10222970 2002-05-23
PCT/IB2003/001910 WO2003100998A1 (en) 2002-05-23 2003-05-19 Method of connecting an umts mobile radio to a network

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EP1510011A1 EP1510011A1 (de) 2005-03-02
EP1510011B1 true EP1510011B1 (de) 2007-08-22

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US (1) US7684832B2 (de)
EP (1) EP1510011B1 (de)
JP (1) JP2005527148A (de)
CN (1) CN100397792C (de)
AT (1) ATE371299T1 (de)
AU (1) AU2003230092A1 (de)
DE (2) DE10222970A1 (de)
WO (1) WO2003100998A1 (de)

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Also Published As

Publication number Publication date
AU2003230092A1 (en) 2003-12-12
EP1510011A1 (de) 2005-03-02
CN100397792C (zh) 2008-06-25
US7684832B2 (en) 2010-03-23
DE60315830T2 (de) 2008-01-24
DE60315830D1 (de) 2007-10-04
JP2005527148A (ja) 2005-09-08
ATE371299T1 (de) 2007-09-15
DE10222970A1 (de) 2004-02-05
CN1656700A (zh) 2005-08-17
WO2003100998A1 (en) 2003-12-04
US20050164723A1 (en) 2005-07-28

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